Only one answer is far from obvious to me.
I'm explain :
If the parents exert any slightest moral constraint in order to extort the consent of the girl I will be in perfect agreement with the last three proposals.
• Never, it would be psychologically damaging
• Never, it would be against her basic rights
• Never, and such a parent should be prosecuted"
But if the young woman believes that her belt will act as a protection against the potential male aggressors or can help her to get rid of a compulsive masturbatory practice that spoils her life, the 8th proposal « Only if she fully consented » to it remains acceptable.
Provided however that the girl is regular breaks to relieve himself (minimum of one hour each tonight before going to bed). She must not be trapped after accepting the principle of the belt.
Indeed if a girl agrees each evening a small moment of intimate happiness before falling asleep it would be far from compulsive masturbation as it presented at the beginning of the statement the question.
Between compulsive masturbation and prohibited masturbation there is room for compromise. No ?